Overfishing has left fewer than 100 adult cod in the North Sea, it was reported.

This is different than “100 cod” – not all are adult. Perhaps the author changed his or her mind as he/she went along writing the article. Perhaps by fewer than 100 adults he/she meant to say something like 98 adults, which leaves 2 juveniles… Nevermind. The caption under the figure in the article said: